Military intervention in politics has been a significant feature of the developing world. Among the South Asian countries, there were number of military interventions in Pakistan's political system. This study provides causes for which political institutions are in worst situation today and what are the reasons behind them. The decline of traditional structures like political parties, pressure groups, parliament, judiciary, executive and virtual death of political processes like constitutionalism and political processes are the number of reasons for the failure. Due to these reasons Military got a chance to strengthen itself and enter into the political vacuum due to the failure of civilian government. The failure of civilian government, Military dictatorship got its way to take over the control of the state. Therefore, Pakistan experienced phases of military rule and democracy after almost every decade. Despite the adoption of the constitution in Pakistan, the military continued to intervene in the political process of the country. Pakistan inherits a low political culture and low economic development that helped Army to intervene in politics.